# Development

**URL:** https://discourse.paraview.org/c/development/6.md?no_subcategories=false&page=27

[Latest](https://discourse.paraview.org/latest.md) · [Categories](https://discourse.paraview.org/categories.md) · [Tags](https://discourse.paraview.org/tags.md)

**Page:** 28

---

## [Compound sources/filters as a new vtkAlgorithm](https://discourse.paraview.org/t/compound-sources-filters-as-a-new-vtkalgorithm/4451)

<div class="topic-metadata">

**Author:** [@kevins](https://discourse.paraview.org/u/kevins)\
**Replies:** 2\
**Last updated:** [June 1, 2020, 2:09pm UTC](https://discourse.paraview.org/t/compound-sources-filters-as-a-new-vtkalgorithm/4451 "2020-06-01T14:09:05Z")

</div>

I want to combine an existing source and filter into one object to encapsulate a pipeline structure. In the class below the pipeline held by the MyCompound is just a reader feeding into a resample filter. The resample fi…

---

## [Paraview 5.7.0 does not load more than 12000 cells-(ubuntu 20.04 python 3.8.2)](https://discourse.paraview.org/t/paraview-5-7-0-does-not-load-more-than-12000-cells-ubuntu-20-04-python-3-8-2/4465)

<div class="topic-metadata">

**Author:** [@lanjal](https://discourse.paraview.org/u/lanjal)\
**Replies:** 4\
**Last updated:** [June 1, 2020, 11:19am UTC](https://discourse.paraview.org/t/paraview-5-7-0-does-not-load-more-than-12000-cells-ubuntu-20-04-python-3-8-2/4465 "2020-06-01T11:19:39Z")

</div>

Hi I created an R script to create an KML ASCII UNSTRUCTURED\_GRID. It works fine, but when I create a file using the same scritpt with more cells I get the following error: ERROR: In /build/paraview-vlxewD/paraview-5.7…

---

## [Summary and custom panels?](https://discourse.paraview.org/t/summary-and-custom-panels/4420)

<div class="topic-metadata">

**Author:** [@kevins](https://discourse.paraview.org/u/kevins)\
**Replies:** 8\
**Last updated:** [May 31, 2020, 2:55am UTC](https://discourse.paraview.org/t/summary-and-custom-panels/4420 "2020-05-31T02:55:33Z")

</div>

I am working on a customized version of paraview that simplifies the user experience. One of the things I found in the paraview wiki that looked interesting was the Summary Panel page, which was marked as obsolete. Were…

---

## [Old gitlab issue have lost their images](https://discourse.paraview.org/t/old-gitlab-issue-have-lost-their-images/4255)

<div class="topic-metadata">

**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 7\
**Last updated:** [May 28, 2020, 2:14am UTC](https://discourse.paraview.org/t/old-gitlab-issue-have-lost-their-images/4255 "2020-05-28T02:14:14Z")

</div>

All old issues (more than 2 years) have lost their images. eg: https://gitlab.kitware.com/paraview/paraview/-/issues/17860 Not practical at all. @cory.quammen

---

## [ParaView support for completely customized application](https://discourse.paraview.org/t/paraview-support-for-completely-customized-application/4406)

<div class="topic-metadata">

**Author:** [@Yoshino](https://discourse.paraview.org/u/Yoshino)\
**Replies:** 5\
**Last updated:** [May 26, 2020, 5:45pm UTC](https://discourse.paraview.org/t/paraview-support-for-completely-customized-application/4406 "2020-05-26T17:45:54Z")

</div>

I’m switching the framework of my app from being paraview-based to totally customization because I find that the former tends to appeal to experts. But then I’m not sure about how many functionalities could I inherit fro…

---

## [Gitlab labels improvements](https://discourse.paraview.org/t/gitlab-labels-improvements/4275)

<div class="topic-metadata">

**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 12\
**Last updated:** [May 21, 2020, 2:22am UTC](https://discourse.paraview.org/t/gitlab-labels-improvements/4275 "2020-05-21T02:22:07Z")

</div>

In the wake of the hackathon, I’ve been thinking of the labels (tags) we are using, and I think it can be improved. Here is the current status : https://gitlab.kitware.com/paraview/paraview/-/labels Here is what I thi…

---

## [filter with variable number of ouput ports - possible?](https://discourse.paraview.org/t/filter-with-variable-number-of-ouput-ports-possible/4345)

<div class="topic-metadata">

**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 2\
**Last updated:** [May 18, 2020, 1:26pm UTC](https://discourse.paraview.org/t/filter-with-variable-number-of-ouput-ports-possible/4345 "2020-05-18T13:26:20Z")

</div>

Is it possible to write a ParaView filter in such a way that the number of output pipes is defined only during execution of the RequestData(...) function? Or in more general terms: a filter where the number of output pi…

---

## [Display of 2D images inside 3D scene in Render View](https://discourse.paraview.org/t/display-of-2d-images-inside-3d-scene-in-render-view/4286)

<div class="topic-metadata">

**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 1\
**Last updated:** [May 8, 2020, 9:46am UTC](https://discourse.paraview.org/t/display-of-2d-images-inside-3d-scene-in-render-view/4286 "2020-05-08T09:46:06Z")

</div>

Some time ago and thanks to hints that I got here in the forum I managed to attach 2D text labels to point items in 3D space. Basically that is working with a plain XML based representation that makes the vtkDataLabelRep…

---

## [Velocity not available for Coloring of Glyph - Potential bug or a feature?](https://discourse.paraview.org/t/velocity-not-available-for-coloring-of-glyph-potential-bug-or-a-feature/1087)

<div class="topic-metadata">

**Author:** [@Reine\_Granstrom](https://discourse.paraview.org/u/Reine_Granstrom)\
**Replies:** 15\
**Last updated:** [May 6, 2020, 2:44am UTC](https://discourse.paraview.org/t/velocity-not-available-for-coloring-of-glyph-potential-bug-or-a-feature/1087 "2020-05-06T02:44:17Z")

</div>

Hi, I posted a question on a ParaView forum on CFD-online.com, and one of the replies I got from an experienced user suggested that I post a thread here to check whether the behaviour is a bug or a feature. Please see …

---

## [Question about debugging practice](https://discourse.paraview.org/t/question-about-debugging-practice/4245)

<div class="topic-metadata">

**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 2\
**Last updated:** [May 4, 2020, 3:01pm UTC](https://discourse.paraview.org/t/question-about-debugging-practice/4245 "2020-05-04T15:01:48Z")

</div>

Quite often I am debugging my code by simply inserting some temporary output instead of running the software in the debugger. I am sure that I am not alone with this practice, for many good reasons! But there is one thin…

---

## [VTK Polyhedra and Ghost Points](https://discourse.paraview.org/t/vtk-polyhedra-and-ghost-points/4224)

<div class="topic-metadata">

**Author:** [@woodring](https://discourse.paraview.org/u/woodring)\
**Replies:** 0\
**Last updated:** [April 29, 2020, 10:59pm UTC](https://discourse.paraview.org/t/vtk-polyhedra-and-ghost-points/4224 "2020-04-29T22:59:34Z")

</div>

I’ve developed a reader that uses the VTK Polyhedra type because the base cell type in the source data fit (boundary representation cell). Though, I seem to be having issues with ghost points. I’ve applied what I think …

---

## [ParaView's minimum python version?](https://discourse.paraview.org/t/paraviews-minimum-python-version/4205)

<div class="topic-metadata">

**Author:** [@Dave\_DeMarle](https://discourse.paraview.org/u/Dave_DeMarle)\
**Replies:** 2\
**Last updated:** [April 29, 2020, 6:04pm UTC](https://discourse.paraview.org/t/paraviews-minimum-python-version/4205 "2020-04-29T18:04:54Z")

</div>

Hey what is ParaView’s minimum Python version these days? thanks

---

## [Again - "client server wrapping" - any fool proof instructions about how to ensure it is "properly initialized"?](https://discourse.paraview.org/t/again-client-server-wrapping-any-fool-proof-instructions-about-how-to-ensure-it-is-properly-initialized/4066)

<div class="topic-metadata">

**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 5\
**Last updated:** [April 15, 2020, 4:16pm UTC](https://discourse.paraview.org/t/again-client-server-wrapping-any-fool-proof-instructions-about-how-to-ensure-it-is-properly-initialized/4066 "2020-04-15T16:16:10Z")

</div>

Of course the code is again a bit more complicated than in the basic examples - and the result is the famous message about “…client server wrapping probably not properly initialized”. And yes I see: the \*ClientServer.cx…

---

## [ParaView OpenGL version](https://discourse.paraview.org/t/paraview-opengl-version/4065)

<div class="topic-metadata">

**Author:** [@embeddedmz](https://discourse.paraview.org/u/embeddedmz)\
**Replies:** 3\
**Last updated:** [April 15, 2020, 11:21am UTC](https://discourse.paraview.org/t/paraview-opengl-version/4065 "2020-04-15T11:21:59Z")

</div>

Hi, I have a CMake project that is building many stuff : a program in which ParaView 5.4.1 is embedded and other programs that only uses ParaView libraries (the VTK that it bundles). I’m having trouble with the program…

---

## [ParaView internal Python libraries are still broken](https://discourse.paraview.org/t/paraview-internal-python-libraries-are-still-broken/3314)

<div class="topic-metadata">

**Author:** [@MBG](https://discourse.paraview.org/u/MBG)\
**Replies:** 6\
**Last updated:** [April 13, 2020, 5:46pm UTC](https://discourse.paraview.org/t/paraview-internal-python-libraries-are-still-broken/3314 "2020-04-13T17:46:28Z")

</div>

I tested new nightly build MacOS ParaView-5.7.0-1035-g5b9485e246.app and it’s still broken like to MacOS ParaView-5.7.0.app: from scipy import linalg Traceback (most recent call last): File "\<console\>", line 1, in \<mo…

---

## [Prefered method of compiling on MacOS?](https://discourse.paraview.org/t/prefered-method-of-compiling-on-macos/4054)

<div class="topic-metadata">

**Author:** [@wsherman](https://discourse.paraview.org/u/wsherman)\
**Replies:** 2\
**Last updated:** [April 13, 2020, 5:45pm UTC](https://discourse.paraview.org/t/prefered-method-of-compiling-on-macos/4054 "2020-04-13T17:45:37Z")

</div>

Hello ParaView developers, In other threads, we’ve had discussions about the OpenVR plugin on MacOS, and I’d like to give that a try myself, which means compiling on my MacBookPro. So my question is: what’s the best me…

---

## [Trigger Reload Files from within property widget code](https://discourse.paraview.org/t/trigger-reload-files-from-within-property-widget-code/3965)

<div class="topic-metadata">

**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 4\
**Last updated:** [April 6, 2020, 9:12am UTC](https://discourse.paraview.org/t/trigger-reload-files-from-within-property-widget-code/3965 "2020-04-06T09:12:34Z")

</div>

Is there a way how the code of a property widget can trigger a “reload files” (like what the user can do with F5 in ParaView)? Because I have a button there in a property widget related to a specialized file reader that…

---

## [External Plugins with separated contexts for every individually loaded file](https://discourse.paraview.org/t/external-plugins-with-separated-contexts-for-every-individually-loaded-file/3908)

<div class="topic-metadata">

**Author:** [@stefan\_m](https://discourse.paraview.org/u/stefan_m)\
**Replies:** 3\
**Last updated:** [March 28, 2020, 4:35pm UTC](https://discourse.paraview.org/t/external-plugins-with-separated-contexts-for-every-individually-loaded-file/3908 "2020-03-28T16:35:42Z")

</div>

Hi all, We wrote a plugin for our own data format. If we load just one file with this plugin, everything is working fine. If we load in the same ParaView session another file with the same plugin, the context of our Par…

---

## [Alter labels of paraview plugin xml](https://discourse.paraview.org/t/alter-labels-of-paraview-plugin-xml/3883)

<div class="topic-metadata">

**Author:** [@Yoshino](https://discourse.paraview.org/u/Yoshino)\
**Replies:** 0\
**Last updated:** [March 25, 2020, 10:23am UTC](https://discourse.paraview.org/t/alter-labels-of-paraview-plugin-xml/3883 "2020-03-25T10:23:16Z")

</div>

Paraview provides many sources and filters by its sources.xml and filter.xml, of which custom app is able to choose a subset to generate corresponding menu content. But what if I want them with different labels(i.e. tex…

---

## [ImportError: No module named paraview.detail.pythonalgorithm](https://discourse.paraview.org/t/importerror-no-module-named-paraview-detail-pythonalgorithm/3863)

<div class="topic-metadata">

**Author:** [@majo\_vlas](https://discourse.paraview.org/u/majo_vlas)\
**Replies:** 1\
**Last updated:** [March 23, 2020, 12:16pm UTC](https://discourse.paraview.org/t/importerror-no-module-named-paraview-detail-pythonalgorithm/3863 "2020-03-23T12:16:05Z")

</div>

I made an installer for mac of a ParaView-based application. What I did: Execute /Applications/Qt/5.9.9/clang\_64/bin/macdeployqt paraview\_clone1.app Copy /Users/user/Desktop/Project/paraview\_clone1.app into /Users/use…

---

## [Representations with PV5.8](https://discourse.paraview.org/t/representations-with-pv5-8/3853)

<div class="topic-metadata">

**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 9\
**Last updated:** [March 23, 2020, 10:07am UTC](https://discourse.paraview.org/t/representations-with-pv5-8/3853 "2020-03-23T10:07:56Z")

</div>

It looks like in the field of representations there are some changes/improvements with PV5.8 (https://kitware.github.io/paraview-docs/v5.8.0/cxx/MajorAPIChanges.html), and indeed I have now successfully recompiled all my…

---

## [Delete all sources in the pipeline programatically?](https://discourse.paraview.org/t/delete-all-sources-in-the-pipeline-programatically/3864)

<div class="topic-metadata">

**Author:** [@majo\_vlas](https://discourse.paraview.org/u/majo_vlas)\
**Replies:** 3\
**Last updated:** [March 23, 2020, 8:51am UTC](https://discourse.paraview.org/t/delete-all-sources-in-the-pipeline-programatically/3864 "2020-03-23T08:51:39Z")

</div>

Is there a way to delete all the sources with their “child’s” and everything in the pipeline programmatically? Something like for x in GetSources(): Delete(x) ?

---

## [Need some help debugging build failure of 5.8.0](https://discourse.paraview.org/t/need-some-help-debugging-build-failure-of-5-8-0/3827)

<div class="topic-metadata">

**Author:** [@paulmelis](https://discourse.paraview.org/u/paulmelis)\
**Replies:** 6\
**Last updated:** [March 22, 2020, 2:43pm UTC](https://discourse.paraview.org/t/need-some-help-debugging-build-failure-of-5-8-0/3827 "2020-03-22T14:43:33Z")

</div>

I’m attempting to build ParaView 5.8.0, specifically an MPI-enabled server-only version based on EGL that is to be used on our GPU nodes. I’m not building it directly myself, but using the EasyBuild framework. I previous…

---

## ["matplotlib" library is outdated, could we load external one instead?](https://discourse.paraview.org/t/matplotlib-library-is-outdated-could-we-load-external-one-instead/3315)

<div class="topic-metadata">

**Author:** [@MBG](https://discourse.paraview.org/u/MBG)\
**Replies:** 1\
**Last updated:** [March 20, 2020, 11:47pm UTC](https://discourse.paraview.org/t/matplotlib-library-is-outdated-could-we-load-external-one-instead/3315 "2020-03-20T23:47:07Z")

</div>

In MacOS ParaView 5.7.0: import matplotlib; matplotlib.\_\_version\_\_ '1.1.1' From PYTHONPATH: python2.7 -c "import matplotlib; print (matplotlib.\_\_version\_\_)" 2.2.4 I tried to change import paths order by ParaView se…

---

## [Error executing ParaView custom apps](https://discourse.paraview.org/t/error-executing-paraview-custom-apps/3155)

<div class="topic-metadata">

**Author:** [@majo\_vlas](https://discourse.paraview.org/u/majo_vlas)\
**Replies:** 1\
**Last updated:** [March 20, 2020, 11:11pm UTC](https://discourse.paraview.org/t/error-executing-paraview-custom-apps/3155 "2020-03-20T23:11:20Z")

</div>

I’m trying to execute ParaView custome apps but I have problems. I generate with cmake without problem But when I do make and make install I get and error because it seems to be looking for a file and file is not th…

---

## [Multiple errors with Qt, qsql\_mysql, while building ParaView on MacOS](https://discourse.paraview.org/t/multiple-errors-with-qt-qsql-mysql-while-building-paraview-on-macos/3109)

<div class="topic-metadata">

**Author:** [@maria\_vlas](https://discourse.paraview.org/u/maria_vlas)\
**Replies:** 1\
**Last updated:** [March 20, 2020, 6:46pm UTC](https://discourse.paraview.org/t/multiple-errors-with-qt-qsql-mysql-while-building-paraview-on-macos/3109 "2020-03-20T18:46:46Z")

</div>

I have been trying to build ParaView to test the custom apps examples here on MacOS. I have followed the site instructions for the superbuild here. I have had several problems with the Qt build, after some tweaking her…

---

## [Add two renderView to a centralWidget](https://discourse.paraview.org/t/add-two-renderview-to-a-centralwidget/3816)

<div class="topic-metadata">

**Author:** [@lololo\_wote](https://discourse.paraview.org/u/lololo_wote)\
**Replies:** 1\
**Last updated:** [March 16, 2020, 2:29am UTC](https://discourse.paraview.org/t/add-two-renderview-to-a-centralwidget/3816 "2020-03-16T02:29:03Z")

</div>

In a ParaView example, this is the structure: Instead of using the MultiViewManager, I want two renderViews, side by side. How can I add this in Qt Designer or in the code?

---

## [\[solved\] alternative to vtkBitArray](https://discourse.paraview.org/t/solved-alternative-to-vtkbitarray/3794)

<div class="topic-metadata">

**Author:** [@yohanlty\_total](https://discourse.paraview.org/u/yohanlty_total)\
**Replies:** 2\
**Last updated:** [March 12, 2020, 9:45am UTC](https://discourse.paraview.org/t/solved-alternative-to-vtkbitarray/3794 "2020-03-12T09:45:35Z")

</div>

Dear experts, I am writting a plugin and I want to put inside a vtkUnstructuredGrid a boolean array. I have chosen the vtkBitArray to store this boolean array and I works as expected with the default Render View Layout…

---

## [Implementation of AMD ProRender and Radeon Rays in Paraview](https://discourse.paraview.org/t/implementation-of-amd-prorender-and-radeon-rays-in-paraview/3744)

<div class="topic-metadata">

**Author:** [@Quefrency](https://discourse.paraview.org/u/Quefrency)\
**Replies:** 5\
**Last updated:** [March 5, 2020, 6:44pm UTC](https://discourse.paraview.org/t/implementation-of-amd-prorender-and-radeon-rays-in-paraview/3744 "2020-03-05T18:44:46Z")

</div>

Hello, I would like to know if anyone has looked at AMD’s ProRender engine and ray casting Radeon Rays to see if it can be integrated into Paraview like Nvidia’s IndeX, Optix, OSPRay, etc. This would help in having more…

---

## [Recommended API for iterating over a whole image or its subset](https://discourse.paraview.org/t/recommended-api-for-iterating-over-a-whole-image-or-its-subset/3751)

<div class="topic-metadata">

**Author:** [@yohanlty\_total](https://discourse.paraview.org/u/yohanlty_total)\
**Replies:** 2\
**Last updated:** [March 5, 2020, 3:06pm UTC](https://discourse.paraview.org/t/recommended-api-for-iterating-over-a-whole-image-or-its-subset/3751 "2020-03-05T15:06:08Z")

</div>

Hello, I am writing a ParaView plugin where I encounter the following 2 cases: 1- for the 1rst I need to iterate over the surrounding adjacents points of a vtkImageData; 2- for the other one, I have to do a whole swee…

[Previous page](https://discourse.paraview.org/c/development/6.md?no_subcategories=false&page=26)

[Next page](https://discourse.paraview.org/c/development/6.md?no_subcategories=false&page=28)